Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements Of Operations [Abstract]
Net sales	$ 126,861	$ 120,750	$ 376,087	$ 351,330
Cost of goods sold	(99,229)	(92,304)	(294,913)	(269,506)
Gross margin	27,632	28,446	81,174	81,824
Selling, general and administrative	(19,681)	(17,588)	(57,596)	(54,846)
Environmental Remediation Expense	3,600		3,600
Gain on sale of facility			1,835
Litigation Settlement Reimbursements		1,175		1,175
Operating income (loss)	4,351	12,033	21,813	28,153
Interest and other income	158	101	457	252
Income before income taxes	4,509	12,134	22,270	28,405
Income tax provision	(1,430)	(4,510)	(6,790)	(10,640)
Net income (loss)	$ 3,079	$ 7,624	$ 15,480	$ 17,765
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	7,853	7,804	7,844	7,770
Diluted	7,930	7,922	7,929	7,872
EARNINGS (LOSS) PER SHARE OF COMMON STOCK:
Basic	$ 0.39	$ 0.98	$ 1.97	$ 2.29
Diluted	$ 0.39	$ 0.96	$ 1.95	$ 2.26